Super Simple Python: Grader

Super Simple Python is a series of Python projects you can do in under 15 minutes. In this episode, we’ll be covering how to build a simple grader in under 15 lines of Python!

We don’t need to import any libraries for this function. For this episode we’re going to simply be building some functions out and using them like we did in the Unit Convertor, and the Calculator.

Grader Function in Python

Let’s pretend like we’re lucky and we go somewhere with a 10 point scale. If you’re in the UK I’m looking at you. When I went to school (in America) we had a 7 point system. I was a straight A student anyway, but it’s still bullshit to me lol.

Anyway, let’s get started by creating a grader function that takes one parameter. We expect our score parameter to be a float. In our function, we can just go down the list and return A, when the score is above 90, B when the score is about 80, and so on until we get to F. Note that we don’t have to build an upper bound on any of these grades because we go down in order and return when we find what we need.

def grader(score: float):
    if score > 90.0:
        return 'A'
    if score > 80.0:
        return 'B'
    if score > 70.0:
        return 'C'
    if score > 60.0:
        return 'D'
        return 'F'

Testing the Grader Function Out

Now that we’ve built the grader, let’s test it out. All we are going to do to test it is print out the return value from different numbers. Notice how I included some integers in the test. This is just to illustrate a point. Even though our function expects floats, we can pass integers and Python will interpret it correctly!


We should expect to see the output: A, B, C, B, D from above. When we run our program we get an output like the image below.

As expected, we got A, B, C, B, D.

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Yujian Tang

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